Expose doc comment contents

[the-mikedavis]

#195 parsed doc comments but it exposed the nodes for the doc comment markers (!//) rather than the content of the comments. The comment content is useful for injecting markdown into the comments:

; injections.scm
([(line_comment !doc) (block_comment !doc)] @injection.content
 (#set! injection.language "comment"))

((doc_comment) @injection.content
 (#set! injection.language "markdown")
 (#set! injection.combined))

I've also changed the line doc comment slightly to fix an issue with the marker node (it unnecessarily consumed the character after the ///) and to include the line's line-ending, which is useful to tree-sitter-markdown.

cc @ProfDoof I've only made the change to line comments, I may need some help to make block comments have the same structure

Block comment changes are included as well.

[amaanq]

Do you want to alias it as a literal instead for consistency? (might be easier for queries too?)

[the-mikedavis]

Do you mean the marker or the comment's contents? I'm not very familiar with this grammar but it looks like the existing literal rules are used for values like ints/floats/etc. With these changes the queries we would add for Helix are pretty simple (- just what I listed above)

[amaanq]

I meant the markers, sorry for not being clear. I do like your content changes though

Though you'll need to rebase since there was an edge case I fixed w.r.t. empty line doc comments eating up contents on the following line

[amaanq]

Also regenerate with 0.21.0 😁 (and redo the test updates with -u, that no longer updates all test header delimiters to be 80 chars long)

[amaanq]

Really sorry for taking forever on this

[the-mikedavis]

No worries, I've been testing this locally in the meantime.

Thanks!